North Korea: US in race to address threat, says HR McMaster

White House national security adviser HR McMaster says the US is "In a race" to address the threat from North Korea. "There are ways to address this problem short of armed conflict, but it is a race because he's getting closer and closer, and there's not much time left," Mr McMaster said, in reference to North Korean leader Kim Jong-un. North Korea has accused the US and neighbouring South Korea of being warmongers ahead of large-scale joint air exercises between the two allies that begin on Monday. North Korea said the Hwasong-15 missile it fired on Thursday, which reached an altitude of 4,475km and flew 950km in 53 minutes, could have been tipped with a "Super-large heavy warhead" capable of striking the US mainland. Reuters news agency reported on Sunday that research was under way to locate new sites on the US west coast for the possible installation of Terminal High Altitude Area Defense anti-ballistic missiles, similar to those already deployed in South Korea to protect against potential attacks from the north.